21755950 has 24 divisors (see below), whose sum is σ = 42597720. Its totient is φ = 8244000.

The previous prime is 21755941. The next prime is 21755959. The reversal of 21755950 is 5955712.

It is an interprime number because it is at equal distance from previous prime (21755941) and next prime (21755959).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21755959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10501 + ... + 12400.

It is an arithmetic number, because the mean of its divisors is an integer number (1774905).

Almost surely, 2^21755950 is an apocalyptic number.

21755950 is a deficient number, since it is larger than the sum of its proper divisors (20841770).

21755950 is a wasteful number, since it uses less digits than its factorization.

21755950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22932 (or 22927 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 21755950 is about 4664.3273898816. The cubic root of 21755950 is about 279.1639602718.

The spelling of 21755950 in words is "twenty-one million, seven hundred fifty-five thousand, nine hundred fifty".